VMWare holds the mindshare but can Microsoft's Hyper-V server compete and take over the market? According to Reuters, "Customers of Microsoft, the world's biggest software maker, can start downloading the product on Microsoft's website on Thursday, Microsoft said."
Ina Fried reports "{Microsoft] plans on July 8 to make it an option via Windows Update." The report also quotes MS employees describing the uphill battle they face in competing with VMWare and others.